We are planning multiple 2 node SLES for SAP 15 SP1 cluster for SAP HANA and SAP NetWeaver ASCS. Below are some details.

1. 2 data centers about 16 miles apart
2. SLES for SAP 15 SP1
3. VMware ESXi 6.7
4. SAP HANA 2.0
6. PURE Storage SAN in each datacenter

Since the SBD device needs to be shared, how do I protect this if I have 2 datacenters. The shared disk would be in one or the other datacenter, but not both, or can it?
If we lose the datacenter that is hosting the SBD then we lose it. We are thinking about using Azure to host an iSCSI target device for this, but this means that our on-prem clusters would rely on a SBD STONITH device in the cloud.
Is this a viable solution? I have read the clustering guide from SUSE but I have not seen anywhere this is addressed. Any recommendations, suggestions and documentation would be appreciated.